Add `Wallet::list_output` method #4215

Job	Run time
Check no_std	37s
Check WASM	50s
Build and test (stable, true, --no-default-features)	3m 7s
Build and test (stable, true, --all-features)	3m 36s
Rust fmt	10s
Build and test (1.57.0, --no-default-features)	2m 49s
Build and test (1.57.0, --all-features)	2m 36s
clippy_check	55s
	14m 40s

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